GPS not working after update to IOS11

If you can't find your current location on your iPhone, iPad, or iPod touch

1. Go to Settings > Privacy > Location Services and make sure that Location Services and Maps is set to While Using.
2. Make sure that you set the date, time, and time zone correctly on your device. Go to Settings > General > Date & Time. If possible, use Set Automatically.
3. Restart your device.
4. Make sure that cellular data or Wi-Fi is on and that you have an active connection.
5. Try a different location or switch to a different Wi-Fi network.

Location Services uses GPS, Bluetooth, crowd-sourced Wi-Fi hotspot, and cellular towers to determine your location. Learn more about Location Services on your iOS device.

After you go through those steps provided, let us know if the issue is also occurring in Maps, or is specific to those other apps. Also, does it occur on different wireless networks, or your cellular data with Wi-Fi turned off? You can turn off Wi-Fi by going to Settings > Wi-Fi. Please be aware that this will use your cellular data until you re-enable Settings > Wi-Fi. Thanks and have a wonderful evening

I have done all these things (and more) and my location only updates sporadically on all apps that use location, including Apple Maps, since updating to iOS 11. It worked OK before the update. The only thing that changed was the OS.